The Collaborative International Dictionary
Incompatible \In`com*pat"i*ble\, a. [Pref. in- not + compatible: cf. F. incompatible.] [It was formerly sometimes written incompetible.]
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Not compatible; so differing as to be incapable of harmonious combination or coexistence; inconsistent in thought or being; irreconcilably disagreeing; as, persons of incompatible tempers; incompatible colors, desires, ambition.
A strength and obduracy of character incompatible with his meek and innocent nature.
--Southey. -
(Chem.) Incapable of being together without mutual reaction or decomposition, as certain medicines.
Incompatible terms (Logic), terms which can not be combined in thought.
Syn: Inconsistent; incongruous; dissimilar; irreconcilable; unsuitable; disagreeing; inharmonious; discordant; repugnant; contradictory. See Inconsistent.
Wiktionary
a. 1 (context obsolete English) Outside of one's competence 2 (archaic form of incompatible English)